Roles of Heterotrimeric G Protein in NAA Induction and Growth and Development of Arabidopsis thaliana Roots Separation and purification of G protein from Arabidopsis thaliana Involvement of Heterotrimeric G Protein α and β Subunits in Defense Responses of Wheat to Puccinia triticina Mutant Arabidopsis Heterotrimeric G-Protein Affects Several Developmental Processes